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#!/bin/sh
#==============================================================================+
# File name : resizevm.sh
# Begin : 2013-04-18
# Last Update : 2013-04-23
# Version : 1.0.0
#
# Description : Shell script used to resize Virtual Machine image.
#
# Website : https://github.com/fubralimited/CentOS-KVM-Image-Tools
#
# Author: Nicola Asuni
#
# (c) Copyright:
# Fubra Limited
# Manor Coach House
# Church Hill
# Aldershot
# Hampshire
# GU12 4RQ
# UK
# http://www.fubra.com
# support@fubra.com
#
# License:
# Copyright (C) 2012-2013 Fubra Limited
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# See LICENSE.TXT file for more information.
#==============================================================================+
# USAGE EXAMPLE:
# sh resizevm.sh VM_NAME VM_SIZE
# sh resizevm.sh centosvm 20G
# NOTE: This script assume that the VM images are created using the centoskvm.sh
# script and located at /data/images
# ensure script is being run as root
if [ `whoami` != root ]; then
echo "ERROR: This script must be run as root" 1>&2
exit 1
fi
# check for vm name
if [ -z "$1" ]; then
echo "ERROR: No argument supplied. Please provide the Virtual machine name."
exit 1
fi
# name of the image
VMNAME=$1
# check for new size
if [ -z "$2" ]; then
echo "ERROR: Missing size argument. Please provide the Virtual machine name new size."
exit 1
fi
echo "Resizing VM ..."
# new size of the image
VMSIZE=$2
# extract VM file name
VMFILE=$(virsh dumpxml $VMNAME | grep "<source file='" | sed "s/[\t ]*<source file='\/data\/images\///" | sed "s/'\/>//")
export TMPDIR=/data/tmp/
# shut the virtual machine down
virsh shutdown $VMNAME
# change directory
cd /data/images
# clone VM image
cp -f $VMFILE $VMFILE.tmp
# resize the cloned image (i.e. 20 GB)
qemu-img resize $VMFILE.tmp $VMSIZE
# resize the partitions
virt-resize --expand /dev/vda2 --LV-expand /dev/vg_main/lv_root $VMFILE $VMFILE.tmp
# make a backup of the VM for any evenience:
mv -f $VMFILE $VMFILE.backup
# sparsify image
virt-sparsify --format qcow2 --compress $VMFILE.tmp $VMFILE
# remove the resized image
rm -f $VMFILE.tmp
# set file ownership
chown qemu:qemu $VMFILE
# restart the virtual machine
virsh start $VMNAME
# if the new image works fine, then we can delete the backup image:
#rm -rf $VMFILE.backup
echo "Process Completed. Please try the new image and delete the backup file if everything is OK."
#==============================================================================+
# END OF FILE
#==============================================================================+
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